119-tooth timing belt

MXL Pitch Timing Belt for Precision Demanding Assemblies

The 119-tooth belt (ref. PSP-BD119MXL) is designed to work with MXL pitch pulleys, one of the most common standards in small-scale precision drive applications. With a thickness of 1.8 mm, it offers a compact profile that fits well in the tight spaces typical of slot car assemblies and technical modelling projects.

Main Features

• Number of teeth: 119
• Pitch: MXL (compatible with MXL pitch pulleys)
• Thickness: 1.8 mm
• Toothed profile that ensures positive grip and slip-free transmission
• Compact design suitable for tight spaces

Function and Performance

MXL pitch timing belts work through direct engagement with the pulley, eliminating the slippage associated with smooth belts. This results in a more precise and predictable transmission, with less torque loss and significantly quieter operation compared to metal pinion and crown gear transmissions. For assemblies where mechanical noise matters or where synchronisation between parts is critical, this type of belt is a technically sound solution.

Compatibility

This belt is compatible with any pulley or drive system that uses the MXL pitch standard. It is essential to verify that the width of the receiving pulley is consistent with the width of the belt before installation. The number of teeth (119) determines the total length of the belt, so it must be checked that the centre-to-centre distance of the assembly corresponds to this measurement.

Installation and Preparation

The installation does not require special tools, but attention must be paid to tensioning. A belt that is too loose will generate play and loss of response; too tight may strain the bearings or prematurely wear the teeth. It is recommended to adjust the tension until the belt shows no noticeable lateral play but allows slight transverse movement when pressed with a finger.

Common Mistakes

• Mixing different belt and pulley pitches (MXL, XL, L…): the teeth will not engage correctly even if the width seems similar.
• Not checking the centre-to-centre distance before choosing the number of teeth.
• Installing the belt with excessive tension thinking it improves transmission: the effect is the opposite and shortens its lifespan.

Frequently Asked Questions

What does MXL pitch mean in a timing belt?

MXL is a timing belt pitch standard with a tooth spacing of 2.032 mm (0.080 inches). It is one of the smallest pitches available and is commonly used in small-scale precision applications, such as drive mechanisms in slot cars, light robotics, and modelling machinery.

How do I know if this belt is compatible with my pulleys?

You need your pulleys to be MXL pitch and their width to be equal to or less than the width of the belt. Additionally, check that the centre-to-centre distance of your assembly corresponds to the length of a 119-tooth belt in MXL pitch.

How many teeth do I need for my assembly?

The number of teeth determines the length of the belt. To calculate it, you need to know the distance between the centres of the two pulleys and the diameter of each. There are online timing belt calculators that facilitate this process by entering the pitch and dimensions of the system.

Can I combine this belt with pulleys of a different pitch, such as XL?

No. Each pitch standard (MXL, XL, L, HTD…) has a different tooth geometry. Mixing them would cause poor engagement, noise, and accelerated wear, or directly make it impossible to install the belt.

How often should I check or replace the belt?

It depends on usage and working tension. In slot car assemblies with intensive use, it is advisable to periodically check if the teeth show visible wear or if the belt has lost flexibility. A belt in good condition should not show cracks, deformed teeth, or excessive play in the engagement.

The PSP-BD119MXL is a 119-tooth MXL pitch timing belt, 1.8 mm thick, designed for precision drive systems in slot car builds, RC mechanisms, and technical modelling applications. Its positive tooth engagement ensures accurate, slip-free power transmission with minimal noise. Always pair with MXL-compatible pulleys and verify centre distance before installation.